题目内容
解方程:
①4.2+0.5x=5.6;
②x-
x=
;
③
=
.
①4.2+0.5x=5.6;
②x-
| 3 |
| 5 |
| 2 |
| 7 |
③
| 4 |
| 0.6 |
| x |
| 0.9 |
①4.2+0.5x=5.6,
4.2+0.5x-4.2=5.6-4.2,
0.5x=1.4,
0.5x÷0.5=1.4÷0.5,
x=2.8;
②x-
x=
,
(1-
)x=
,
x=
,
x÷
=
÷
,
x=
×
,
x=
;
③
=
,
0.6x=4×0.9,
0.6x=3.6,
0.6x÷0.6=3.6÷0.6,
x=6.
4.2+0.5x-4.2=5.6-4.2,
0.5x=1.4,
0.5x÷0.5=1.4÷0.5,
x=2.8;
②x-
| 3 |
| 5 |
| 2 |
| 7 |
(1-
| 3 |
| 5 |
| 2 |
| 7 |
| 2 |
| 5 |
| 2 |
| 7 |
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 7 |
| 2 |
| 5 |
x=
| 2 |
| 7 |
| 5 |
| 2 |
x=
| 5 |
| 7 |
③
| 4 |
| 0.6 |
| x |
| 0.9 |
0.6x=4×0.9,
0.6x=3.6,
0.6x÷0.6=3.6÷0.6,
x=6.
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